Stretching is considered an important step before engaging in sports. in an investigation to see whether stretching before phsical exertion reduces sports injuriews, who would the control group most likely be?

The Control Group is the group that doesn't stretch.
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Explanations:
When trying to identify the control group in an experiment, you must first identify what the "change" is because the group that the change applies to will be the experimental group. This experiment's change is stretching.

Using this logic...

Control Group: Non-Stretching Group
Experimental Group: Stretching Group